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Asset Retirement Obligations - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Asset Retirement Obligations |  |
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation | $ 17,606,771 | $ 16,854,354
APS |  |
Asset Retirement Obligations |  |
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation | 17,606,378 | $ 16,800,254
Cholla | APS |  |
Asset Retirement Obligations |  |
Asset retirement obligation, period increase (decrease) | 36,000 |
Four Corners Coal-Fired Power Plant | APS |  |
Asset Retirement Obligations |  |
Asset retirement obligation, period increase (decrease) | (7,000) |
Palo Verde | APS |  |
Asset Retirement Obligations |  |
Asset retirement obligation, period increase (decrease) | 33,000 |
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation | 34,000 |
Regulatory Liability | 1,000 |
Navajo Coal-Fired Power Plant | APS |  |
Asset Retirement Obligations |  |
Asset retirement obligation, period increase (decrease) | $ 8,000 |

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